Patent GB-422957-A (GB)
Title: Improvements in the manufacture of plastic masses
IPC: C08L27/24
Filed: 1933-07-17
Abstract: Plastic masses, such as pressed articles, plates (substitute for glass), films, sheets or foils (coating foils for cigarette tips, wrapping foils, adhesive foils, patterns or supports for prints), layers for recording sound (by cutting the sound track or by pressing, e.g. by the Edison or Berliner method), coating layers, impregnating agents for fabrics, layers for electric insulation, insulating fabrics, artificial fibres, artificial threads, masses for the reproduction and printing arts, and adhesive or intermediate layers for composite glass, are manufactured, by methods involving pressing, blowing, rolling or casting, or by the wet or dry spinning process, from polyvinyl halides the halogen content of which has been raised above that corresponding with the formula CH2 : CH Hal (Hal being Cl or Br), alone or mixed with polymerization products of other aliphatic or aromatic unsaturated compounds, e.g. polystyrol, the additional halogenation being, if desired, also applicable to the mixture.  Mixed polymerization products, e.g. of vinyl chloride and acetate, which have been after-halogenated may also be used, but the use of chlorinated polyvinyl halides mixed with chlorinated polymers of acrylic acid or its homologues or derivatives is excluded.  There may also be incorporated any known additions to plastic masses, e.g. softening agents, plasticizers, filling materials, pigments or organic dyestuffs, or also cellulose derivatives.  The sheets or foils may be provided with a metallic coating and are suited for the preparation of electrical condensers.  In examples, polyvinyl chloride containing 60--65 per cent of chlorine is employed as follows: (1) it is dissolved in methylene chloride and methanol and the solution is cast into foils which may be used for wrapping purposes, or, if the solution contains a pigment, such as bronze powder, as coatings for cigarette tips; (2) it is mixed with a softening agent, e.g. an aryl phosphoric ester or an aryl phthalic ester, and pressed into a block from which sheets are made and are fashioned, e.g. by blowing, into articles such as toys, boxes or cups; (3) it is dissolved in methylene chloride, benzene and butyl acetate and the solution is used as a lacquer, e.g. for wires, or as an impregnating agent for webs of fabric (e.g. balloon envelopes). Specification 401,200 is referred to.  The Specification as open to inspection under Sect. 91 comprises also the use of chlorinated polyvinyl chloride for the manufacture of photographic articles, particularly of the kind which directly or indirectly come into contact with photographic emulsions.  In additional examples, polyvinyl chloride containing 60--65 per cent of chlorine is employed as follows: (1) it is pressed to form sheets which are coated with a photographic emulsion; the product is suitable for phototechnical and X-ray work and for recording sound photographically; (2) it is mixed with a filler, e.g. slate dust, asbestos or wood dust, and, if desired, soot, and injected into moulds to produce spool cores or other spool pieces; (3) it is formed by pressing or rolling, with or without the addition of a filler or softening agent, into casings for roll films or film packs, single parts for cameras, developing dishes, or with suitable dyes, e.g. the pinatype dyestuff violet, soluble in ether, known under the Registered Trade Mark "Höchst," into light filters.  This subject-matter does not appear in the Specification as accepted.ALSO:Coating compositions are manufactured from polyvinyl halides the halogen content of which has been raised above that corresponding with the formula CH2 - CH Hal (Hal being Cl or Br), alone or mixed with polymerization products of other aliphatic or aromatic unsaturated compounds or their halogenation products (except chlorinated polymers of acrylic acid or its homologues or derivatives), or with other known additions, e.g. softening agents, plasticizers, filling materials, pigments or organic dyestuffs, or cellulose derivatives.  In an example a lacquer, e.g. for wires, comprises a solution of polyvinyl chloride containing 60--65 per cent of chlorine in methylene chloride, benzene and butyl acetate.  Specification 401,200, [Group IV], is referred to.ALSO:Adhesive foils, and adhesive layers in composite glass, are manufactured from polyvinyl halides, the halogen content of which has been raised above that corresponding with the formula CH2 : CH Hal. Specification 401,200, [Group IV], is referred to.ALSO:Foils suitable for coating cigarette tips are manufactured from polyvinyl halides, the halogen content of which has been raised above that corresponding with the formula CH2 : CH Hal (Hal being Cl or Br).  In an example, a foil is cast from a solution in methylene chloride and methanol of polyvinyl chloride containing 60-65 per cent of chlorine, to which has been added a suitable pigment, e.g. bronze powder.  Specification 401,200, [Group IV], is referred to.